A 17-year-old girl comes to the GP because of heavy menstrual flow. She has a history of easy bruisability and epistaxis. Laboratory studies show:
Hb: 9.5 g/dL
Hct: 28.5%
Platelets: 260,000/μL
Bleeding time: 9 minutes
PT: 13 seconds
PTT: 35 seconds
Platelet aggregation studies: Normal
Which of the following is the most likely diagnosis?
Hemophilia A
Idiopathic thrombocytopenic purpura
Thrombotic thrombocytopenic purpura
Vitamin K deficiency
Von Willebrand disease
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Cut-to-the-chase Answer (0:52):
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HY USMLE Answer (13:28):
